The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 04, 1997
Filed:
Jun. 08, 1994
Katsumi Onodera, Kanagawa, JP;
Fuji Electric Co., Ltd., , JP;
Abstract
A magnetic recording medium which includes a non-magnetic base plate, a magnetic layer disposed on the base plate, and a carbon protective layer containing hydrogen disposed on the magnetic layer. The protective film may include a plurality of layers, including a first layer having a hydrogen content lower than a hydrogen content in a second layer disposed on the first layer. Alternatively, the carbon protective film may have a hydrogen content which gradually continuously increases from a bottom surface thereof to a top surface thereof. A method is also disclosed in which a non-magnetic base plate having a magnetic layer formed thereon is sputtered in a sputtering chamber having two spaced apart gas feed pipes connected thereto, wherein the base plate is moved from the first gas feed pipe to the second gas feed pipe, and the second gas feed pipe feeds a sputtering gas at a higher flow rate than the first gas feed pipe.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile